Abstract: The present disclosure relates to a brake disc including a braking part having a circular plate shape having a hollow portion and a plurality of coupling portions protruding and extending from an inner diameter surface thereof, and a hat part disposed in the hollow portion and having a plurality of insertion portions protruding laterally, in which the plurality of coupling portions is respectively coupled to the plurality of insertion portions, and the coupling portion of the braking part and the insertion portion of the hat part are joined to only one of an outboard portion or an inboard portion of the braking part. According to the present disclosure, it is possible to reduce noise occurring at a position at which the hat part and the braking part are coupled to each other and improve cooling performance.

Abstract: Disclosed are a method of manufacturing cage for a constant velocity joint and a cage for a constant velocity joint manufactured using the same for providing a cage having improved hardness, strength, and elongation while having a structure with a uniform core part and surface and for ensuring economic feasibility by reducing manufacturing time. The method includes a cutting operation of forming a structure having an outer shape by cutting a cylindrical pipe, forming an outer circumference of the cut structure to have a curved surface thereon, performing a turning operation on a surface of the formed structure, a punching operation of forming a window in the surface of the structure on which the turning operation is performed, a broaching operation of processing an edge of the window formed via punching, and a heat treatment operation of fully hardening the completely broached cage via austempering.

Abstract: A method for manufacturing a trunnion for a constant velocity joint, the trunnion having a plurality of journal units provided outside around a hub unit, the method including a first step of manufacturing the trunnion, a second step of thermally treating a rounded outer circumferential surface of the journal unit, and a third step of thermally treating a connection unit disposed between the journal unit and the hub unit and having a diameter smaller than that of the journal unit.

Abstract: A method for manufacturing a trunnion for a constant velocity joint, the trunnion having a plurality of journal units provided outside around a hub unit, the method including a first step of manufacturing the trunnion, a second step of thermally treating a rounded outer circumferential surface of the journal unit, and a third step of thermally treating a connection unit disposed between the journal unit and the hub unit and having a diameter smaller than that of the journal unit.

Abstract: Disclosed are a method of manufacturing cage for a constant velocity joint and a cage for a constant velocity joint manufactured using the same for providing a cage having improved hardness, strength, and elongation while having a structure with a uniform core part and surface and for ensuring economic feasibility by reducing manufacturing time. The method includes a cutting operation of forming a structure having an outer shape by cutting a cylindrical pipe, forming an outer circumference of the cut structure to have a curved surface thereon, performing a turning operation on a surface of the formed structure, a punching operation of forming a window in the surface of the structure on which the turning operation is performed, a broaching operation of processing an edge of the window formed via punching, and a heat treatment operation of fully hardening the completely broached cage via austempering.

Abstract: A brake disc, in which a hat part that is mounted on a hub and a disc part that provides friction surfaces with brake pads are made of different materials and are combined, includes: a plurality of bridges protruding and circumferentially arranged around an edge of the hat part for coupling to the disc part; a plurality of vanes defining a channel for air flow; and a plurality of coupling pillars, which are fixedly in contact with the bridges, respectively, arranged between a pair of disc plates. The coupling pillars are fixedly in contact with both sides of the bridges while exposing front ends of the bridges.

Abstract: Disclosed is a brake disc for vehicles including a ring-shaped disc part provided with an insertion space formed at the central region thereof, a hub part disposed within the insertion space and provided with recesses formed on the external circumferential surface thereof, and connection parts configured to connect the disc part and the hub part, wherein each of the connection parts is divided into a curved section extending from the internal circumferential surface of the disc part and having both curved side surfaces and a rectilinear section extending from the curved section, having both flat side surfaces and inserted into each of the recess, and widths of the curved section and the rectilinear section are decreased in a direction toward the hub part.

Abstract: Disclosed is a brake disc for vehicles including a ring-shaped disc part provided with an insertion space formed at the central region thereof, a hub part disposed within the insertion space and provided with recesses formed on the external circumferential surface thereof, and connection parts configured to connect the disc part and the hub part, wherein each of the connection parts is divided into a curved section extending from the internal circumferential surface of the disc part and having both curved side surfaces and a rectilinear section extending from the curved section, having both flat side surfaces and inserted into each of the recess, and widths of the curved section and the rectilinear section are decreased in a direction toward the hub part.

Abstract: A telescopic shaft is provided.

Abstract: Disclosed are a brake disc manufactured from heterogeneous materials and a method of manufacturing the brake disc. In particular, the brake disc manufactured from heterogeneous materials, in which the number of bridges may be optimized to improve castability and relieve stress, thereby eliminating occurrence of a crack and the like which may be generated due to a difference in a thermal expansion coefficient between a friction part and a hat part.

Abstract: Disclosed is a brake disk. The brake disk includes a friction part having a coupling aperture within a center thereof and a plurality of recessed portions repeatedly formed at a predetermined interval along an inner circumference of the coupling aperture, in which bevels protrude from inner surfaces of the recessed portions, respectively. The bevels are tapered along upper and lower sides thereof toward protruding centers. The brake disk also includes a hub having a plurality of protrusions inserted into and attached to the recessed portions when coupled to and received in the coupling aperture of the friction part via a cast-bonding method, along a circumference thereof.

Abstract: Disclosed is a brake disk. The brake disk includes a friction part having a coupling aperture within a center thereof and a plurality of recessed portions repeatedly formed at a predetermined interval along an inner circumference of the coupling aperture, in which bevels protrude from inner surfaces of the recessed portions, respectively. The bevels are tapered along upper and lower sides thereof toward protruding centers. The brake disk also includes a hub having a plurality of protrusions inserted into and attached to the recessed portions when coupled to and received in the coupling aperture of the friction part via a cast-bonding method, along a circumference thereof.

Abstract: Disclosed is a uni-body type heterogeneous material brake disk. In particular, the brake disk includes a friction part configured to be selectively in contact with a pad; and a hub joined with a bearing. More specifically, the friction part and the hub are made of heterogeneous materials through a uni-body type mold. To accomplish this, a connector connecting the friction part and the hub which are vertically spaced apart from each other is laterally spaced apart from the hub, and a bottom of the connector is connected with the hub. In doing so, an elevated platform is formed to prevent a casting from running over between the connector and the hub and an interface made of heterogeneous materials is formed in the connector.

Abstract: A brake disc is disclosed which includes a friction unit having a coupling aperture formed at a center thereof, insert protrusions and depressions which are provided in a sawtooth formation at predetermined intervals along a circumference of the coupling aperture, wherein chamfers are formed at a predetermined angle on one or more of the upper and lower surfaces of the insert protrusions, and first locking parts locked into upper or lower spaces of the depressions. A hat unit, formed of a material different from that of the friction unit, coupled to the coupling aperture of the friction unit, and including insert recesses formed along a circumference thereof so that the insert protrusions are fitted therein, and second locking parts formed at predetermined intervals in the insert recesses so that they are inserted into the depressions and engage with the first locking parts, and to a method of producing the same.